sounds vagely familiar. I have had some experience with some of the issues you are now addressing.
- my mom eventually just stopped driving, but in doing so she couldn't go out as much, because physically she wasn't always "up to it" when we were able to bring her out. So she isolated, which worsened her depression. I commend you and your Mom for trying to get her depression diagnosed so hopefully she can move on in a forward motion.
- the alcoholic in my life ... how do I say this... had a solution for everything, as long as HE was not the one who had to implement it. He had "problems" so he had not time/patience.for some reason he thought the rest of us didn't have any of our own problems. I do not want to offend you in any way. I only mention it because it helped me not waste moments of my(and my loved ones) precious life obsessing about the alcoholics "opinions", there is a program called ALANON. you may want to google it to find out more info on it.
-My mom has passed away. My brother dealt with her passing in his own way. Thanks to ALANON I don't have to inquire how. He showed up to "say goodbye" the day before she passed. He showed up to make her final arrangements and was at the wake/funeral. If after you look into what ALANON is IF you decide it may be helpful, perhaps when you speak to the MH facility you could mention ALANON. Many of them are alcohol treatment centers as well, and may have ALANON information to help your mom if they find it would be helpful to her.
-whatever happens just hold true that you loved your Mom and you wanted what you sincerely thought was best for her. I would call that true love. Bless you.